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Exam (elaborations)

AS-Level EDEXCEL 2025 Chemistry PAPER 1

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AS-Level EDEXCEL 2025 Chemistry PAPER 1

Institution
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Centre Number Candidate Number
AS-Level EDEXCEL 2025
Chemistry PAPER 1
Pearson Edexcel Level 3 GCE
Tuesday 13 May 2025
Morning (Time: 1 hour 30 minutes) Paper
reference 8CH0/01
Chemistry
Advanced Subsidiary
PAPER 1: Core Inorganic and Physical Chemistry

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Information

•• The total mark for this paper is 80.
The marks for each question are shown in brackets

• For
– use this as a guide as to how much time to spend on each question.
the question marked with an asterisk (*), marks will be awarded for your
ability to structure your answer logically, showing how the points that you make


are related or follow on from each other where appropriate.
A Periodic Table is printed on the back cover of this paper.

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•• Checkallyouryouranswers
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, Answer ALL questions.
Some questions must be answered with a cross in a box . If you change your mind about an




DO NOT WRITE IN THIS AREA
answer, put a line through the box and then mark your new answer with a cross .
1 Chlorine, Cl2 , and silicon tetrachloride, SiCl4 , are covalently bonded molecules with
low boiling temperatures.
(a) The definition of electronegativity is the ability of an atom to attract
(1)
A a single bonding electron from a covalent bond

B a pair of electrons from a covalent bond
C electron density from a neighbouring atom
D two electrons from a positive ion

(b) Draw a dot-and-cross diagram of silicon tetrachloride, showing outer shells of
electrons only.
Use crosses (×) for silicon electrons and dots (•) for chlorine electrons.




DO NOT WRITE IN THIS AREA
(2)




DO NOT WRITE IN THIS AREA




2

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, (c) Explain, using electronegativity values, why both chlorine and
silicon tetrachloride are non-polar molecules.
(3)
DO NOT WRITE IN THIS AREA




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(d) Explain why the boiling temperature of chlorine (−34 °C) is lower than that of
silicon tetrachloride (57°C).
(2)

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DO NOT WRITE IN THIS AREA




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(Total for Question 1 = 8 marks)




3
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